Texas Instruments BQ24027DRCT

Overview

BQ24027DRCT from Texas Instruments is a single-chip Li-ion/Li-polymer linear charger IC with autonomous AC-adapter and USB power-source selection, 4.2 V regulation accuracy ±1%, 1-A max AC charge current, and integrated power FET for space-constrained portable devices such as smartphones and digital cameras.

For engineers reviewing the BQ24027DRCT datasheet, BQ24027DRCT pinout, BQ24027DRCT application, or BQ24027DRCT equivalent, key selection criteria include USB-100/500 mA selectable charge rate via ISET2, battery temperature monitoring support (TS input), precharge conditioning at 2.8–3.2 V, automatic recharge threshold at VO(REG) − 0.10 V, and thermal shutdown at 165 °C.

Technical Context

The BQ24027DRCT implements autonomous dual-input power management: AC adapter takes priority over USB; if both are absent, it enters sleep mode with ≤5 µA standby current. It executes three-phase charging-preconditioning (IO(PRECHG) = 5–100 mA), constant-current (up to 1 A), and constant-voltage (4.2 V ±1%)-with termination based on either taper-current detection (10% of selected USB rate or programmable AC rate) or minimum current (I(TERM) = 11–25 mA).

Unlike earlier bqTINY-II variants, BQ24027DRCT omits the taper timer (t(TAPER)) and terminates immediately upon taper-current detection during voltage-regulation phase; it retains full I(TERM) detection and battery-recharge functionality. Its TS input supports PTC thermistor-based temperature qualification using internal 102 µA current source and dual thresholds (V(LTF) = 0.500 V, V(HTF) = 2.500 V).

Key Specifications

Pinout & Package

Package: 10-pin DRC (3 mm × 3 mm MLP) with exposed thermal pad electrically connected to VSS; requires soldering thermal pad to PCB ground plane for thermal performance (θJA = 46.87 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion linear charger applications.

Compared with BQ24022DRCR and BQ24025DRCR, BQ24027DRCT uniquely combines TS-based temperature qualification with the longest charge timer (25.2 ks), making it optimal for high-reliability portable devices requiring full thermal safety and flexible battery chemistry support.

Availability

BQ24027DRCT is available at Aetrix Electronics and suitable for smartphones, digital cameras, and MP3 players requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for BQ24027DRCT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in energy-efficient electronics.

The bqTINY-II product line-including BQ24027DRCT-is designed specifically for ultra-compact, single-cell Li-ion/Li-pol charging in portable consumer electronics, integrating power-path management, safety timers, and autonomous input selection into monolithic solutions.

FAQ

What is the function of the ISET2 pin on the BQ24027DRCT?

The ISET2 pin on the BQ24027DRCT is a digital input that selects the USB charge current: low-level signal configures 100 mA, high-level configures 500 mA, and high-impedance disables USB charging entirely. This enables host-controlled compliance with USB 2.0 power specifications without requiring additional logic. The BQ24027DRCT does not use ISET2 for AC current setting - that is handled exclusively by the ISET1 resistor.

Does the BQ24027DRCT support battery temperature monitoring?

Yes, the BQ24027DRCT supports battery temperature monitoring via its TS pin, which accepts voltage from a PTC thermistor biased by an internal 102 µA current source. It compares the TS voltage against fixed thresholds (V(LTF) = 0.500 V, V(HTF) = 2.500 V) to suspend charging outside the safe temperature range. This functionality is confirmed in the device's ordering table and electrical characteristics section for BQ24027DRCT.

How does the BQ24027DRCT handle charge termination?

The BQ24027DRCT uses two independent termination methods: (1) taper-current detection at 10% of the selected USB rate (10 mA or 50 mA) or programmable AC rate, and (2) minimum-current cutoff (I(TERM) = 11–25 mA). Unlike earlier bqTINY-II versions, BQ24027DRCT terminates immediately upon taper detection - it does not employ a taper timer. Both methods ensure robust, chemistry-agnostic termination.

What package type and thermal characteristics apply to the BQ24027DRCT?

The BQ24027DRCT uses the DRC package: a 3 mm × 3 mm, 10-pin MLP with exposed thermal pad connected internally to VSS. Its thermal impedance is θJA = 46.87 °C/W (JEDEC High-K board), with 1.5 W power rating at TA < 40 °C and 0.021 W/°C derating above 25 °C. Proper soldering of the thermal pad to a PCB ground plane is mandatory for thermal reliability.

Can the BQ24027DRCT be used without connecting the TS pin?

Yes, the BQ24027DRCT operates fully without the TS pin connected - temperature qualification is optional. When TS is left unconnected or tied to VSS, the device skips temperature checks and proceeds with charging normally. However, omitting TS forfeits thermal fault protection, so this configuration is only recommended for applications with externally managed thermal safety or non-critical environments.